Paper stock preparation



2 sheets-smet 1 E. K.l MANsFlELD PAPER STOCK PREPARATION Filed June'm, 1933 l l lnlzm Apri] 21, 1936.

April 21, 1936, E; K. MANSEIELD 2,038,374

PPER STOCK PREPARATION Filed June 14, 1955 2 Seets-Sheet 2 In ae ovz.

25 6 or 8 hours, s o that a large loss may be suered paratus.

`iuiuapte1in1ii. 21, 193s l I 2,038,374

UNITED STATE-S PATE-NTl OFFICE PAPER s'rook rREPAnA'noN s Everett K. Mansfield, New London, Conn. ,Application June 14, 1933, serial No. 675,762'

2 claims. (ci. :iz-2o) This invention relates .to methods of debering the positive action which takes place when the and hydrating4 paper stock, immediately precedstock is forced by a positively driven, unyieldablef ing delivery to the paper making machine. This operating device` into engagement with a fixed operation, as ordinarily performed, has required operating device. ,I the simultaneous operation of a number, usually Also by providing a'connected series of devices, 5 six or more, refining engines, either of the beater. of the impact type above referred. to, having type having a horizontal roll, or the Jordan graduated screens through which the stock isdisf type, to supply a single papermaking machine, charged from each casing, so arranged that the these machines usually being operated from 2 to 6 stock may be operated on to an increased or a in hours or more for each charge, according to condiminished extent as it is supplied to the paper ditions, and the powervrequired for their opera- A making machine, and the extent of defiberlzation tion being very large in amount. and hydration may be readily varied and the re- In a machine of this type, in which'a roll, havsuits of. the variation may be noted in the product ing blades rigidly mounted therein, is operated in shortly after the variation is made.

l5 practically xed relation to a bed in which similar For a more complete disclosure of the-invention 15 blades are mounted, the fibers of the'stock which reference is made to the following specification in is passed between them are frequently cut or connection with the accompanying drawings in shortened to an undesirable extent. Also, with whichzthe system above referred to, if it is found that Fig. 1 is an elevation, in diagram form, of a the product is not satisfactory, by reason of imdeilbering and hydrating system embodying my 20 perfect deilberization, or hydration, or both, so invention. that achangev in this operation is necessary to Figpz is a sectional view of a type of apparatus correct lthe defect, the change when made will which is employed in connection therewith.

not usually affect the product for approximately Fig. 3 is a detail view of a portion of said ap- 25 before it can be determined whether any change Fig. 4 is a view, similar to Fig.' l, of'` a modified which was made is effective. 'I form of the invention and f The objects of my invention are to provide an Figs. 5, 6. and 7 are detail views indicating improved method, or system of debering and.- parts of the apparatus shown in. Fig. 4. hydrating paper stock, which will enablel the op- Asia preliminary to the process hereinafter de- 30 eration to be much more rapidly performed than scribed, the stock must be broken up and satlis possible with the method above referred to, and urated with water. This may be accomplished by which will resultl in a large saving of horse power means of an ordinary horizontal beater, in which and will enable practically perfect uniformity of the roll is raised at a considerable distance above de'oerization and hydration to be secured withthe bed and from which the stock will be dis- 35 out cutting or shortening the fibers to a substancharged when it is sufficiently brpken up and sattial4 extent. Also which will enable a practically urated, to form what is known as slush stock.. continuoussystem of deiiberization and hydration Another and preferable means of breaking up to be employed so that the employment of large the stock .consists in the employment, in lieu of stuff chests will be unnecessary, and defects in the the beater, of a type of machine known as a ham- 40 product of the. paperV making machine may be mer mill, a form offwhich is illustrated in Figs. 2 corrected in a comparatively short time, as comand 3, and which comprises a casing` III having a pared with what has beenpossibie with previously rotor I2 mounted on a horizontal shaft I3 thereemployed systems. l in, said rotor having a series of arms I4 pivotally I accomplish these objects by operating on the i mounted thereon in radial relation, each arm be- 45 partly disintegrated stock while thoroughly sating arranged'toswing in the direction of rotation urated with water, by striking the same, while to a limited extent from a radial position, andv unsupported, or yieldably supported in water, having a head, of any suitable form.' on its free within an enclosed casing, by means of rapidly end. As machines of this-type are well known,

moving, loosely mounted swinging arms, or heads, Afurther description thereof is thought to be un- 50 sothat defiberization and hydration Willbe caused necessary. In practice they have usually been by the impact of theplatter on'the stock in' the employed in disintegrating material when dry. presence of water, andthe action on the stock In the arrangement shown in Fig. 1, a suitable will'be a matter of relative inertias ofthe striksource off water supply I5 `is provided at the en#- o; ing devices and the stock, as distinguished from trance. opening of a hammer mill I6, of the type 55 rapidly swinging arms is yieldably sustained above referred to, so that the stock will be partly saturated and broken up by the rotor', and then discharged through a coarse screen in the bottom of the casing, into an outlet pipe I'I, and chest I the stock may be further disintegrated and hydrated by circulating it through the chest, or it may then be immediately discharged into a sec--` ond hammer'mill 22, in which the principal opery ation takes place. The mill 22 is provided with a screen, as 23, in its bottom through which all material must pass before being delivered to its discharge pipe 24, and a series of nozzles, as 25, are preferably connected to the water supply and arranged to direct water jets onto the screen, to assistin the passage of the deiibered stock therethrough and to enable a suitable supply of water to' be maintained within the casing. l

In practice, thewater level will be maintained at about the middle of the casing, so that' the stock will be suspended in the water while the of rotor will strike the material, a rapid succession of `blows while it is freely suspended, or yieldably sustained within.

the casing. As the arms are yieldable against centrifugal action when they strike the stock, they will yield to some extent, and, as the'stock when an armystrikes it, the disintegrating and hydrating action will be wholly by impact, the force of which will depend on the relative inertias of the arms and the material which they strike.

As a result the stock will ybe rapidly deiibered and hydrated by the impact and there will be practically no tendency to cut the bers. When the stock has been suiicientlyoperated on, it

' will pass through the screen, which will be kept clear by the churning action of the rotor and by the water jets directed on the inner side of the screen. 'I'he size of the reticulations in the screen will primarily determine the extent of deberization and `hydration.

The operation of securing complete deberization and hydration of the paper stock, by means of the mechanical action thereon, in the presence of water, of 'the rapidly swinging arms of the mill, is performed much more rapidly and with l a much smaller expenditure of power, than the time and` power r'equired by the refining engines which have previously been employed.

Asindica'ted in Fig, 4 a series-hammer mills 28, 29 and 30 may-be employed in lieu of the single mill 22 the mill 28 having a relatively coarse screen' 28' in its outlet, the mill 29 a iiner screen 29', and the mill 30 a still iiner screen .30'.

Suitable by-passing pipes 32, 33, 34 are provided, so that the stock may be passed through any one of the mills only, any two or all three thereof, by merely manipulation valves in an. obvious manner. The defibering operation may thus be greatly facilitated, as compared with results secured by the use of a single mill. After the stock has passed through the screen vof the mill 22, or the screens of the series of 'mills 28, 29, 30, it may be discharged into a chest 35, and further hydrated by a circulating pump 36, and may then be delivered to a Jordan engine 31 and finally to a stuif chest at the paper machine, not shown, the use of this apparatus being varied according to conditions.

' By.. this arrangement, the supply of refined stock to the paper making machine may be made continuous, or practically so, so that the Stock will have but little opportunity to settle after being discharged into the stui chest, and if variation of the product of the paper making machine is desired, which is dependent on the extent of deberization and hydration, such variations may be readily made and will soon be effective.

I claim:

1. The process of deiibering and hydrating brous material, which consists in partly disintegrating the materia-l and saturating it with water, delivering the saturated material to an enclosing chamber and subjecting it while held in aqueous suspension therein to a rapid succession of blows by centrifugally actuated means, to effect deberization and hydration of the material by the impact resulting from the relative inertias of said means and the material brous material which has been sufficiently treated to be discharged from the chamber and adding further saturatedbrous material while maintaining the same in aqueous suspension for treatment by the centrifugally actuated means.

2. An apparatusl for supplying deiibered, hydrated material to a paper making machine, which comprises a casing, means to supply partly disintegrated material there water supply means for said casing adequate o maintain the material therein in aqueous suspension, a series of' yieldably mounted operating devices in said casing arranged to be centrifugal'ly actuated therein at high speeds, to subject the material while held in aqueous suspension rapid succession of blows, to affect deiiberization and hydration thereof by impact resulting from the relative inertias of the operating devices and material, said casing having a reticulated discharge outlet adapted to permit the material 1.'. L when suiiiciently operated on to pass therefrom.

EVERE'IT K. MANSFIELD.

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